Rotary pump



N STATES PATENT OFFICE WILLIAM PEIRCE, OF NEW ORLEANS, LOUISIANA.

ROTARY PUMP.

Specicatonof Letters Patent No. 19,581, dated March 9, 1858.

To all 'whom it 'may concern.'

Be it known that I, WM. PEIRGE, of the city of New Orleans7 parish of Orleans, State of Louisiana, have made a new and useful Improvement in Rotary Pumps; and I hereby declare the following is a full and eXact description thereof, reference being had to the accompanying drawings, and to the letters of references marked thereon, making a part of this specification, in which- Figure l is a view showing interior of pump, one of side plates being removed. Fig. 2 is a section of a" a' through axis of shaft. Fig. 3 shows the manner of constructing the center piece of pump so as to receive the .wings or blades. Fig. 4 is a view of projection in looking from interior.

Similar characters of reference in the several figures denote the same part.

The character of pump here considered is that in which the fluid is'raised by blades projecting from a rotary center piece.

My improvement consists in connecting opposite blades and arresting their outward movement by shoulders of the opposite blade stopping against the center piece, when combined with an internal projection hereinafter to be set forth. The advantage of the improvement being that a steady discharge of fluid can be maintained with but slight velocity of rotation.

In the drawing a is the center portion of the pump rotated by crank L, and grooved as shown in the drawing for the accommodation of the blades 0. These are in form as shown by the lightly shaded portion of Fig. 2, two blades being connected together and having an amplitude of longitudinal motion slightly less than the width of the water channel, so that the stopping of the shoulder, of one wing against the central portioV a of the pump arrests the protrusion of the opposite wing. This protrusion is designed to extend so far that the end of the blade will clear thev interior of the rim d. On the side of the entrance and discharge pipes the casing has a projection fm, filling at its largest part the space between the rim d and the outer edge of center piece a; the top and bottom being cut away as shown in Fig. 4L to permit the entrance and discharge of water.

In operation, the blades fall of their own weight, and draw the water through pipe g as indicated by arrows, discharging it at f. The projection m prevents the water from passing between the center piece c and rim l be the rotation fast or slow.

I am aware that separate blades designed to be thrown out by centrifugal force, and having shoulders to arrest their movement, have been used in connection with an eccentric inner surface. This I do not claim, as such pumps require rapid rotation to render them operative. I also disclaim the connecting of blades and arresting their motion by shoulders ofthe opposite blade when separately considered.

What I do claim and desire to secure by Letters Patent, is-

The united blades whose amplitude of motion is limited by shoulders of the opposite blade, as described, in combination with the 'projection m filling 'the spacebetween rim d and center piece a, as specified.

IVILLIAM PEIRCE. [L s] Signed and sealed in presence of FRANCIS ARMSTRONG, FRANKLIN ROBERTS. 

